1、Designation: A 841/A 841M 03a (Reapproved 2007)Standard Specification forSteel Plates for Pressure Vessels, Produced by Thermo-Mechanical Control Process (TMCP)1This standard is issued under the fixed designationA 841/A 841M; the number immediately following the designation indicates the yearof orig
2、inal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification2covers steel plates produced by thethermo-m
3、echanical control process (TMCP). The plates areintended primarily for use in welded pressure vessels.1.2 The TMCP method consists of rolling-reduction andcooling rate controls that result in mechanical properties in thefinished plate that are equivalent to those attained usingconventional rolling a
4、nd heat treating processes, which entailreheating after rolling. A description of the TMCP method isgiven in Appendix X1.1.3 Due to the inherent characteristics of the TMCP method,the plates cannot be formed at elevated temperatures withoutsustaining significant losses in strength and toughness. The
5、plates may be formed and post-weld heat-treated at tempera-tures not exceeding 1200F 650C, providing the require-ments of 6.1 are met.1.4 The maximum permitted nominal thickness of platesfurnished to this specification is 4 in. 100 mm for Grades A,B, and C; and 1.5 in. 40 mm for Grades D,3E, and F.1
6、.5 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents. Therefore, each system mustbe used independently of the other. Combining values from th
7、etwo systems may result in nonconformance with this specifi-cation.2. Referenced Documents2.1 ASTM Standards:4A 20/A 20M Specification for General Requirements forSteel Plates for Pressure VesselsA 435/A 435M Specification for Straight-Beam UltrasonicExamination of Steel PlatesA 577/A 577M Specifica
8、tion for Ultrasonic Angle-BeamExamination of Steel PlatesA 578/A 578M Specification for Straight-Beam UltrasonicExamination of Rolled Steel Plates for Special Applica-tions3. General Requirements and Ordering Information3.1 Plates supplied to this product specification shall con-form to Specificatio
9、n A 20/A 20M, which outlines the testingand retesting methods and procedures, permissible variationsin dimensions, quality and repair of defects, marking, loading,etc.3.2 Specification A 20/A 20M also establishes the rules forordering information that should be complied with whenpurchasing plates to
10、 this specification.3.2.1 If the plates are to be subjected to warm forming orpost-weld heat treatment, the order must indicate the tempera-tures and times-at-temperature that will be utilized in suchoperations. (See 6.1 and Specification A 20/A 20M, Supple-mentary Requirement S3.)3.3 In addition to
11、 the basic requirements of this specifica-tion, certain supplementary requirements are available whenadditional control, testing, or examination is required to meetend use requirements. These include:3.3.1 Vacuum treatment,3.3.2 Additional or special tension testing,3.3.3 Additional or special impac
12、t testing, and3.3.4 Nondestructive examination.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.11 on Steel Plates for Boilers and Pressure Vessels.Current edition approved Nov. 1, 2007
13、. Published March 2008. Originallyapproved in 1985. Last previous edition approved in 2003 as A 841/A 841M 03a.2For ASME Boiler and Pressure Vessel Code applications, see related Specifi-cation SA-841/SA-841M in Section II of that Code.3ExxonMobil Upstream Research Company has patents pending concer
14、ning theuse of chemistry ranges in ASTM A 841 Grade D, in combination with specificTMCP routes and/or specific microstructural features. Interested parties are invitedto submit information regarding identification of alternatives to these patented itemsto ASTM International Headquarters. Your commen
15、ts will receive careful consid-eration at a meeting of the responsible technical committee,1which you may attend.4For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the
16、 standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.4 The purchaser is referred to the listed supplementaryrequirements in this specification and to the detailed require-ments in Spec
17、ification A 20/A 20M.3.5 If the requirements of this specification are in conflictwith the requirements of Specification A 20/A 20M, the re-quirements of this specification shall prevail.4. Manufacture4.1 Steelmaking PracticeThe steel shall be killed andshall conform to the fine austenitic grain siz
18、e requirement ofSpecification A 20/A 20M.4.2 The plates shall be produced by the thermo-mechanicalcontrol process.5. Chemical Composition5.1 The chemical composition on heat analysis shall con-form to the requirements given in Table 1, except as otherwiseprovided in Supplementary Requirement S17 of
19、SpecificationA 20/A 20M when that requirement is involved.5.2 If a product analysis is made on a sample taken from thestandard location (see Specification A 20/A 20M), the resultsof the analysis shall not deviate from the limits for the heatanalysis by more than the values given in Table 2.6. Mechan
20、ical Requirements6.1 If the plates are to be subjected to warm forming orpost-weld heat treatment, the test coupons shall be subjected toheat treatment to simulate such fabrication operations. (See3.2.1 and Specification A 20/A 20M, Supplementary Require-ment S3.)6.2 Tension Test RequirementsThe pla
21、tes as representedby the tension-test specimens shall conform to the require-ments given in Table 3.6.2.1 Number and Location of Test CouponsTwo tensiontests shall be made from each plate-as-rolled. One test couponshall be taken from a corner of the plate on each end.6.3 Notch Toughness Test Require
22、ments:6.3.1 Longitudinal Charpy V-notch tests shall be made inaccordance with Specification A 20/A 20M.6.3.2 For GradesA, B and C, unless the test temperature andabsorbed energy requirements are specified in the purchaseorder, the tests shall be conducted at 40F 40C and theaverage absorbed energy fo
23、r each set of three full sizespecimens shall be 15 ftlb 20J or more.6.3.3 For Grade D, unless the test temperature and thelateral expansion requirements are specified in the purchaseorder, the tests shall be conducted at 40F 40C and thelateral expansion for each specimen shall be 0.015 in. 0.4 mmor
24、more.6.3.4 For Grades E and F, unless the test temperature andabsorbed energy requirements are specified in the purchaseorder, the tests shall be conducted at 40F 40C and theaverage absorbed energy for each set of three full sizespecimens shall be 20 ftlb 27 J or more.7. Marking7.1 In addition to th
25、e marking required in SpecificationA 20/A 20M, each plate shall be legibly stamped with theletters “TMC” following the stamped specification designation.TABLE 1 Chemical RequirementsElementComposition, %Grade A Grade B Grade C Grade D Grade E Grade FCarbon, max 0.20 0.15 0.10 0.09 0.07 0.10AManganes
26、et # 1.5 in. 40 mm 0.701.35B0.701.35B0.701.60 1.002.00 0.701.60 1.101.70At 1.5 in. 40 mm 1.001.60 1.001.60 1.001.60CCCPhosphorus, max 0.030 0.030 0.030 0.010 0.015 0.020Sulfur, max 0.030 0.025 0.015 0.005 0.005 0.008Silicon 0.150.50 0.150.50 0.150.50 0.050.25 0.050.30 0.100.45Copper, max 0.35 0.35 0
27、.35 0.50 0.35 0.40Nickel 0.25 max 0.60 max 0.25 max 1.05.0 0.60 max 0.85 maxChromium, max 0.25 0.25 0.25 0.30 0.30 0.30Molybdenum, max 0.08 0.30 0.08 0.40 0.30 0.50Columbium, max 0.03 0.03 0.06 0.05 0.08 0.10Vanadium, max 0.06 0.06 0.06 0.02 0.06 0.09TitaniumDD0.0060.02 0.0060.03DEBoron . . . 0.0005
28、0.002 0.0007 max 0.0007 maxAluminum, min 0.020 total or 0.020 total or . . 0.020 total or 0.020 total or0.015 acidsolubleD0.015 acidsolubleD0.015 acidsolubleD0.015 acidsolubleEAFor each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage points a
29、bove the specified maximum formanganese is permitted, up to a maximum of 1.85 %.BManganese may exceed 1.35 % on heat analysis, up to a maximum of 1.60 %, provided that the carbon equivalent on heat analysis does not exceed 0.47 %, or thevalue specified in Supplementary Requirement S77 when that requ
30、irement is invoked, when based on the following formula:CE 5 C 1 Mn/6 1 Cr 1 Mo 1 V!/5 1 Ni 1 Cu!/15 %When this option is exercised, the manganese content on product analysis shall not exceed the heat analysis content by more than 0.12 percentage points.CNot applicable.DBy agreement, the steel may b
31、e produced with titanium, in which case the minimum aluminum content shall not apply. When this option is exercised, the titaniumcontent, by heat analysis, shall be 0.006 % to 0.02 %, and the actual titanium content shall be reported on the test report.EBy agreement, the steel may be produced with t
32、itanium, in which case the minimum aluminum content shall not apply. When this option is exercised, the titaniumcontent, by heat analysis, shall be 0.006 % to 0.03 %, and the actual titanium content shall be reported on the test report.A 841/A 841M 03a (2007)28. Keywords8.1 pressure containing parts
33、; pressure vessel steel; steelplates; steel plates for pressure vessel applicationsTABLE 2 Product Analysis TolerancesElement Specified Limit, %Tolerances, %UnderMinimumLimitOverMaximumLimitCarbon to 0.15, incl 0.02 0.03over 0.15 0.03 0.04Manganese to 0.60, incl 0.05 0.06over 0.60 to 0.90, incl 0.06
34、 0.08over 0.90 to 1.20, incl 0.08 0.10over 1.20 to 1.35, incl 0.09 0.11over 1.35 to 1.65, incl 0.09 0.12over 1.65 0.11 0.14Phosphorus to 0.020, incl . 0.005over 0.020 . 0.010Sulfur to 0.020, incl . 0.005over 0.020 . 0.010Silicon to 0.30, incl 0.02 0.03over 0.30 to 0.40, incl 0.05 0.05over 0.40 0.06
35、0.06Nickel to 1.00, incl 0.03 0.03over 1.0 to 2.0, incl 0.05 0.05over 2.0 to 3.8, incl 0.07 0.07over 3.8 0.08 0.08Chromium to 0.90, incl 0.04 0.04Molybdenum to 0.20, incl 0.01 0.01over 0.20 0.03 0.03Copper to 1.00, incl 0.03 0.03Vanadium to 0.10, incl 0.01 0.01Columbium to 0.10, incl 0.01 0.01Alumin
36、um to 0.15, incl 0.005 0.01Titanium to 0.010, incl 0.002 0.01over 0.010 0.01 0.01Boron anyAAAProduct analysis is not applicable for this element.TABLE 3 Tensile RequirementsGrades A, B, and C Grade D Grade E Grade FClass 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8Yield strength, min, k
37、si MPato 1.5 in. 40 mm incl 50 345 60 415 100 690 70 485 75 515 70 485 75 515 80 550over 1.5 in. 40 mm to2.5 in. to 65 mm 50 345 60 415A AAAAAover 2.5 in. over 65 mm 45 310 55 380Tensile strength, ksi MPato 1.5 in. 40 mm incl 70904856208010055069014517010001170841045807158810860574582102565705861065
38、9073090110620760over 1.5 in. 40 mm to2.5 in. to 65 mm709048562080100550690A AAAAAover 2.5 in. over 65 mm 65854505857595515655A AAAAAElongation in 2 in. 50 mm,min, %Bto 1.5 in. 40 mm incl 22 22 13 20 19 20 19 18over 1.5 in. 40 mm to2.5 in. to 65 mm 22 22A AAAAAover 2.5 in. over 65 mm 22 22Elongation
39、in 8 in. 200 mm,min, %Bto 1.5 in. 40 mm incl 18 . . 16 15 16 15 14over 1.5 in. 40 mm to2.5 in. to 65 mm 18 A AAAAAover 2.5 in. over 65 mm 18 .ANot applicable.BSee Specification A 20/A 20M for elongation requirement adjustments.A 841/A 841M 03a (2007)3SUPPLEMENTARY REQUIREMENTSSupplementary requireme
40、nts shall not apply unless specified in the order.Alist of standardized supplementary requirements for use at the option of the purchaser are includedin Specification A 20/A 20M. Several of those that are considered suitable for use with thisspecification are listed in this section by title. Other t
41、ests may be performed by agreement between thesupplier and the purchaser.S1. Vacuum Treatment,S2. Product Analysis,S3. Simulated Post-Weld Heat Treatment of MechanicalTest Coupons,S5. Charpy V-Notch Impact Test,S6. Drop Weight Test (for Material 0.625 in. 16 mm andOver in Thickness),S7. High-Tempera
42、ture Tension Test,S8. Ultrasonic Examination in accordance with Specifica-tion A 435/A 435M,S9. Magnetic Particle Examination,S10. Charpy V-Notch Test Curve,S11. Ultrasonic Examination in accordance with Specifica-tion A 577/A 577M,S12. Ultrasonic Examination in accordance with Specifica-tion A 578/
43、A 578M,S13. NDT Temperature Determination,S17. Vacuum Carbon-Deoxidized Steel,S18. Unspecified Elements, andS19. Restricted Chemical Requirements.ADDITIONAL SUPPLEMENTARY REQUIREMENTSAlso listed are additional supplementary requirements suitable for use with this specification.S77. Carbon Equivalent
44、 LimitS77.1 The carbon equivalent, on heat analysis, shall notexceed the limits listed in this section when based on thefollowing equation:CE 5 C 1 Mn/6 1 Cr 1 Mo 1 V!/5 1 Cu 1 Ni!/15 %Grade At = 2 in. 50 mm and under in thickness 0.40%t 2 in. 50 mm in thickness 0.45%Grade Bt = 2 in. 50 mm and under
45、 in thickness 0.45%t 2 in. 50 mm in thickness 0.50%S78. Low Sulfur TreatmentS78.1 Restricted sulfur content shall be specified on theorder. In the absence of such a specification the maximumsulfur furnished under this supplementary requirement shall be0.003 % on heat analysis.NOTE 1The low sulfur tr
46、eatment is for the purpose of enhancing theHIC (Hydrogen Induced Cracking) and SSC (Sulfide Stress Cracking)resistance.S79. Carbon Equivalent LimitS79.1 The carbon equivalent, on heat analysis, shall notexceed 0.27 %, or a lower value as specified in the purchaseorder, when based on the following eq
47、uation:PCM5 C 1Si301Mn 1 Cu 1 Cr201Ni601Mo151V101 5B %APPENDIX(Nonmandatory Information)X1. THERMO-MECHANICAL CONTROLED PROCESSING (TMCP)X1.1 IntroductionThe Thermo-Mechanical ControledProcessing, commonly referred to as “TMCP,” has evolvedfrom the “controlled rolling” (CR) processes, which have bee
48、nknown and used for a number of years. TMCP producesfine-grained steel by a combination of chemical compositionand integrated controls of manufacturing processes from slabreheating to post-rolling cooling, thereby achieving the speci-fied mechanical properties in the required plate thicknesses.TMCP
49、requires accurate control of both the steel temperatureand rolling reductions, and does not involve coiling after thepost- cooling.X1.2 Outline of TMCPAs shown in Fig. X1.1, TMCPmay incorporate three processes, as follows:A 841/A 841M 03a (2007)4X1.2.1 Thermo-Mechanical Rolling (TMR)Steels of finegrain size are produced by rolling in the recrystallization andthe nonrecrystallization region
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